>>>...Tell me what model and I can likely find out what the input impedance is...>>>

I have two. The 75 watt watt one says input impedance = 33K ohms. The 15-watt says 220K ohms.

>>>...around 250,000 ohms or higher with 1 megohm being the typical desired input, is that anything lower will "load" down the small voltage output... Ohm's law tells us the why of it. If the pickup can generate, say, 100mV into a 1 million ohm input, then it could not generate the same voltage into only 10,000 ohm load...>>>>

Ohm's Law is as far as I got with electronic theory. Barely. I will try V=I/R with these values.

>>>...Typically, a guitar jacked into a 10Kohm input will sound "weak" and with not much midrange punch. It also won't sound much like an electric guitar...>>>

Your description fits what I am getting, but I don't see why. If the problem has to do with a circuit that does not let all the signal through, should it not affect all frequencies equally? My limited understanding tells me that the signal that gets through would be just lower in amplitude. How is it that some frequencies are affected and not all of them?

I have heard that the flow of electrons in a circuit can be compared to the flow of water in a hose. Thats pretty much how I think of this stuff. Where did the metaphor break down?

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